Chimney crown vs. chimney cap: what each one does

Understanding the Chimney Crown

The chimney crown is located at the top of the chimney, and it's the first line of defense against the elements. It's made of concrete, metal, or stone and seals the top of the chimney except for the flue opening.

Its purpose is to prevent rainwater from seeping into the masonry. A damaged or cracked crown can lead to serious water damage, so it’s important to repair any issues promptly to avoid structural damage to the chimney.

The Role of a Chimney Cap

The chimney cap sits atop the flue and is a protective barrier that prevents debris, animals, and water from entering the chimney. It includes a mesh screen that allows smoke to escape while keeping out larger particles and critters.

Chimney caps also reduce downdrafts, which can bring smoke back into your home. They are a relatively simple addition that can prevent a host of chimney issues, including animal nests and water damage.

Maintenance and Replacement

Both the crown and the cap require maintenance to ensure they function properly. Inspect the chimney cap for rust or damage, especially after storms, and replace it if it’s no longer intact.

The crown should be checked for cracks or wear, and any issues should be repaired with a weather-resistant sealant. Regular maintenance helps prevent costly repairs and prolongs the life of your chimney.